Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Switch: SHOKCA02DS2

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
661-678 A Santa Clarita: Newhall-Castaic DA CA 7421 AT&T - LOCAL 730      
805-426 A Simi Valley CA 7421 AT&T - LOCAL 730      
818-263 A Van Nuys CA 7421 AT&T - LOCAL 730      
818-477 A Northridge CA 7421 AT&T - LOCAL 730      
818-936 A Canoga Park CA 7421 AT&T - LOCAL 730      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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